Alpana Goel

The mechanism of signature inversion in odd-odd rotational bands

Abstract The signature inversion in the rotational bands belonging to high- j configurations of odd-odd deformed nuclei is analysed within the framework of an axially symmetric rotor plus two-particle model. The signature inversion seen in 160 Ho is reproduced very well, and the mechanism for it is pointed out. While a similar mechanism is seen to operate in 152 Eu and 156 Tb, it has not been possible to reproduce the inversion in these two cases.

Systematics of signature inversion in doubly-odd nuclei and the role of the 12[541] proton orbital

Abstract Some general systematic features of the signature inversion phenomenon in doubly-odd lighter rare-earth nuclei are presented. Schematic calculations are carried out within the framework of the two-quasiparticle plus rotor model (TQPRM) to explain these features. It is found that the systematics can be well explained if the h 9 2 : 1 2 [541] proton orbital is included in the calculations in addition to the complete set of h 11 2 proton and i 13 2 neutron orbitals.

Signature inversion in theK=4− band in doubly-odd152Eu and156Tb nuclei: Role of theh 9/2 proton orbital

The phenomenon of signature inversion in the doubly-odd nuclei152Eu and156Tb is understood within the framework of a two-quasiparticle plus rotor model. It is shown that theh9/2:1/2[541] proton orbital plays a crucial role in reproducing this phenomenon.

Signature reversal in the 2 QP K = 3 and 4 bands of 170Yb

Abstract The K−π=3− and K+π=4− Gallagher pair of bands of 170Yb, having two-quasineutron configuration { 7 2 + [633] n ⊗ 1 2 − [521] n }, exhibit the phenomenon of signature reversal. The two bonds have a mutually opposite phase of odd-even staggering while one would expect the same phase. It is shown that the phenomenon can be explained as a Coriolis effect and has an origin similar to that of the signature inversion phenomenon observed in many odd-odd nuclei.

Band head spin assignment of Tl isotopes of superdeformed rotational bands

The Variable Moment of Inertia (VMI) model is proposed for the assignment of band head spin of super deformed (SD) rotational bands, which in turn is helpful in the spin prediction of SD bands. The moment of inertia and stiffness parameter (C), were calculated by fitting the proposed transition energies. The calculated transition energies are highly dependent on the prescribed spins. The calculated and observed transition energies agree well when an accurate band head spin (I0) is assigned. The results are in good agreement with other theoretical results reported in literature. In this paper, we have reported the band head spin value 16 rotational band of super deformed Tl isotopes.

Newby shift ofK=0 rotational bands in odd-odd rare-earths

A data set of 29 experimentally determined Newby shifts in rare-earth nuclei is examined for the reliability of each values. Using this data set, Newby shifts are obtained which are free from the Coriolis and the particle-particle coupling effects. These new empirical values help resolve the failure of a recently proposed rule for the sign of the Newby shift in the {5/2[413]p − 5/2[642]n} configuration of160Tb and the {5/2[402]p − 5/2[512]n} configuration of174Lu. Also the Newby shifts are significantly modified in two other cases namely the {1/2[411]p − 1/2[521]n} configuration in168Tm and the {1/2[541]p − 1/2[521]n} configuration in172Lu. Only marginal changes are seen in the rest of the cases in the rare-earth nuclei.

Signature splitting in 9/2[624]ν band of 183Os

In this paper we present the Particle Rotor Model calculations to explain energy staggering of one quasiparticle rotational band (9/2[624]ν) observed in 183Os. The role of angular momentum dependence of inertia parameter and rotational correction term appearing in coriolis mixing calculations for explanation of signature effects observed in one-quasiparticle rotational bands is discussed.

Developing and Promoting a Nuclear Security Curriculum at Amity University, India: Beginnings, Successes and Challenges

Amity University is one of India’s leading researchand innovation-driven private universities. The Amity Institute of Nuclear Science and Technology (AINST), established in 2009, contributes to the fulfillment of Amity’s mission to promote national development through philanthropy, education, and research. Recently, courses related to nuclear security and security cultures have been added to the existing AINST curriculum. The purpose of introducing these courses was to enhance the understanding of technical, policy, and regulatory challenges associated with nuclear security and to create a nuclear security culture among relevant local institutions. This paper describes the process involved in establishing nuclear security courses as elective courses in the engineering and technology domain for undergraduate-level and postgraduate-level engineering students at the Institute, discusses both the challenges faced in these early stages as well as the achievements and successes, and outlines future plans for the program.

Unusual Features of rotational bands in 184 Au deformed doubly- odd nucleus

Two-quasiparticle rotational bands of doubly-odd 184 Au have been investigated. The two quasiparticle plus rotor model (TQPRM) calculations are done for the bands where sufficient experimental data is available mainly for the ground state band{3/2(532)π  7/2(514)v}and the excited bands with configuration {1/2(660)π  9/2(624)v} and {1/2(541)π  9/2(624)v}. Peculiar features like second point of signature inversion, signature reversal and band crossing are observed in these bands of 184 Au. The ambiguity regarding the configuration assignment of ground state band is resolved. The calculations for ground state band clearly show that the proton orbital changes from 3/2(532)π to 1/2(541)π with increasing spin. The mechanism of unusual feature like second point of signature inversion is also presented.

Shape Recognition in Presence of Occlusion from Fourier Plane Processing

A new technique for recognition of objects in presence of occlusion is presented in this paper. The Fourier spectrum of a partially occluded shape differs from that of the whole object shape thereby decreasing the 2D correlation between two images. The present method is based on 1D correlation of Fourier Spectrum slices taken from the 2D Fourier Transform of the reference and the test object. For small occlusion, some of the slices are affected depending on the nature of occlusion. Responses of the rest of the slices are unaffected. This study shows that this method not only identify the object in presence of occlusion but at the same time has good discrimination capability.